Metallic hose with guard-coil.



W. GREINER.

METALLIC HOSE WITH GUA'RD COIL.

APPLICATION FILED Nov. 2s. 1913.

1 l 8 1 ,522 Patented May 2, 1916.

Witnesses whelmrelernvenbor, 1 (la. if XW b2 M ALLOW ey y STATES specification.

The most metallic hose which have become known up to the present day have the' disadvantage that they are very sensitive toward outward injuries and do not oer a sufficient, resistance against unwinding. Y

It has been :tried to increase the strength of metallic hose by surrounding them either directly or with interpos'ition of one or several wire textures, with a wire coil of a round/wiresection or with a coil wound of rectangular wire -so as to offer a flat surface. By such means the desired strength is not obtained to the full extent desired, because the windings of the coil have too much side play, even if the ends are secured to the hose, and can therefore displace to a considerable degree longitudinally to the hose.l

According to the present invention an improvement of these conditions is obtained by the guard coil engaging in the outside grooves of the hose, so that the windings of the coil are prevented from an excessive displacement by the. windings^of tlie hose. This arrangement is of particular .advantage, when Vthe guard coil is wound as mentioned .above of vflat wire onf the narrow edge. 'A coil of this kind has a very considerable strength in a radial direction, and

is therefore vefry well adapted to protect the hose against being indented from outside. VIts small resistance in its xial/direction is favorable for the flexibility of the hose, but allowed with the previ sly employed methods undesirable displacements. of the windingsof the guard coll, which disadvantage isavoidedby the present invention.l

Further constructional forms and advantages of the inventionshall hereinafter be more particularly described.

In the accompanying drawing four 'constructional forms of the new metallic hose are exemplified.

Figure l is a side view, partly in section of the one constructional form, the outer coveringof fabric being partly shown only. Fig. 2 is ari end view of Fig. 1. Fig. 3 Ais a second constructional form shown in the Specication of Letters Patent.

'Metallicl Hose with PATENT OFFICE;

ZWICKAU, GERMANY, AssIoNon To GEBBUDEB. .I Acon, or l ZWICKAU, GERMANY, A FIRM. v

METALLIC nosa 'wrm eUAzuaa-oni f Patented May 2, 19.16.

Applicatipn led November 28, 1913. Serial No. 803,488.

same manner as in Fig. 1.- Fig. 4 isa corresponding illustration of a further constructional form. Fig. 5 is a'fourth constructional form.

The metallic hose according to Figs. l and 2 is wound in known manner of the profiles a so that between each two neighborin profiles a there is a recessib. Into th1s recess b the flat wire spiral c is wound on its narrow edge, so that the windings of the flat Iwire spiral have'a limited play, but an excessive displacement of these windings is prevented by the profiles a. 'Therefore is impossible for a wide gap to be formed 1n the armor produced by the lat wire spiral. The spiralA protects the hose both f against injuries from outside and`\against distortion, without impairing its tlexibilt If a texture of wire or th'e like d is la1d around the thusQ produced new' hose, the `strength of the latter -is still further considerably increased without its flexibility v being materially. impaired,l in A fact .more than vwith `the known metallic hose, with which the wire coil is wound directly-'en the hose the windings of the flat wire placed on 'edge act as distance meinbers sothat the whole forms a sort of frame work, the diagonale of which are formed by the windings of the flat wire coil placed on edge. With the lat'- ter novel arrangement furthermore a par- Vticularly good heat insulation is obtaine When, namely, steam orhot liquids and the like are sent through the hose,` the heat can only pass over into the comparatively small section of the narrow. windings of the guard coil and very little only into the large air spaces between thesev windings. By such` means the comparatively small amount'of heat carried olf is distributed over the very large surface of the surrounding wire texture, through the preferably large pores of which besides the atmospheric air can pass and produce a certain cooling eifect. Therefore the new hose can be conveniently held in the hand even if a very hot liquid is flowing throughv it, without any fear of burning the hand or any need of employing a special insulation.

The new metallic hose can be manufactured in a verysimple manner bythe winding and applying of the flat wire spiral being performed at the same operation as the rofles. With the new varrangementy Winding of the hose itself. This method of `With the constructionalform according to Figs. l and 2 the guard coil is embedded into the open outside grooves of the hose.

indenting without impairing the flexibility v of the hose the better, the higher and narrower its prole. VWhen the guard/coil is placed into the open outside grooves of the hose, there exists the danger, that the wind-Y ings may be tipped over by forces acting,`

not in a radial, but in an obliquely axial direction, and that then, in. consequence of the thereby produced enlargementof the inside diameter, they are axiallydisplaced on the hose, what the present invention just intends to avoid. This danger is ,completely avoided when the guard coil is situated, according to Figs. 3 and 4 respectively, in the covered grooves of the hose, and is thus quite inaccessible to the action of oblique axial forces, and only comes into action when radial forces tend to indent the hose.

The embedding of the guard coil in the covered outside grooves of the coil affords,

beside the high edge arrangement of the flat wire, a number of further advantages.

With hose which, for rendering them proof against' acids and the like, are made of a material proof against corrosion, such as bronze and the like, it-would greatly increase the cost, if the guard coil were made of the same expensive, and besides mechanically less strong material. If, however, for suchv guard coils the usual hard drawn iron or steel wire is employed, the latter willl be very soon oxidized by the atmosphere prevailing in chemical works, and the hose would not only Soon become unsightly but also dirty in manipulation, whereas the greatest cleanliness is necessary in works manufacturing food stuffs and victuals.

When the guard coil is furthermore embedded in the covered outside grooves of the hose, the latter works more or less noiseedges of the coil lessly, as the guard coil which encircles the hose lmore or les'soosely will here and there strike against the soft packing invl the same grooves so that even with very jerky operations there will be no clattering or the latter will be damped by the soft packing.

By suitably dimensioningthe height of the guard coil it is further possible, as

-shown in Fig. 3, to obtain the advantage,

that the guard coil serves as an additional In many instances the constructional form l as shown in Figs. 3 and 4 respectively will guide for the hose profiles sliding on each other, and prevents `a tilting of the lattery which would prevent the free movement. This advantage is not; obtained whenl the guard coilis wound in the openl outside grooveszof the hose, and thus touches the circumference of the hose-with its inside surface only. Lastly when the guard coil is embedded in the covered grooves the hose has a much smoother surface, so that it is impossible to injure oneself on the frequently sharp or burred edges of the Hat wire coi-.1.

' The constructional form according to Fig.

4 illustrates a hose for compressed air. The

rubber tube g is surrounded by a metallic hose formed of the known profils. In the covered outside grooves e the fiat wire spiral c is embedded, which is Wound in course of the manufacture. l

With the constructional form according to Fig. 5.k the guard coil c is again placed in the open outside grooves 'b of the metal- .lic hose. The spiral is,lhowever, provided with a thickened beading on its outsideedge. Hereby the mechanical strength of the hose against excessive bending strains is greatly increased without the flexibility being impaired, as the mass of 'material lies just in l the outer fiberA which is subject'to the most dangerous tensile Astrain under bending stresses. side edge vof the spiral covers) theroutside grooves of the hose, vsogthat dirt and A grit can less easily penetrate into these grooves and impair the free movement, and besides the appearance of the hose is a more compact and pleasing one. The enlarged bead on the outside edge of the spiral furthermore is in so far of advantage, as it is frequently desirable to keep the outside of the hose cool. As, now, the guard coil is enlarged at' its outside edge, the heat conducted by its conductivity from the hose is distributed at its outer surface over a larger area so that the ,hose remains cooler. Lastly the enlargement will be morer convenient in operating the hose, as there are no Sharp projecting outward. I claim: 1. As an article of manufacture, a flexible metallichose having a flat metallic reinforcl ing strip wound edgewise thereon with free lateral play. 2. As an article of manufacture, a flexible Furthermore the bead on the out- Y metallic hose of hard material comprising interfitting metallic profile members forming the wall of the hose, and a fiat metallic reinforcing strip Wound edgewise between adjacent proile members.

3. As an article of manufacture, a flexible metallic hose having a recessed wall, and a fiat metallic reinforcing strip wound edgewise with free lateral play in the recesses in the wall of said hose.

4. As an article of manufacture, a flexible metallic hose comprising overlapping metallic profile members forming covered recesses and constitutin the wall of the hose, and a gua-rd coil of at wire wound on its narrow edge arranged with free lateral play in said covered recesses.

5. As an article of manufacture, a flexible metallic hose having a recessed Wall, and a guard coil of flat wire wound on its narrow edge` with free lateral play in the recesses in the wall of said hose, and means to prevent entry of dirt between said guard coil and the side faces of said recesses.

6. As an article of manufacture, a flexible metallic hose having an externally recessed metallic wall, a guard coil of Hat Wire wound on its narrow edge and with free lateral play in the recesses in said wall, and a wire texture with large perforations coverin said wire coil.

. As an article of manufacture, a exible metallic hose comprising a plurality of interengaging profile members forming a recess at their points of interen agement, and a flat metallic guard strip coi ed on its narrow edge iii said helical recess.

8. As an article of manufacture, a flexible metallic hose having a flat metallic reinforcing strip wound edgewise thereon with free lateral play, said reinforcing strip being substantially flush with or projecting beyond the outer circumference of said hose.

9. As an article of manufacture, a iexible metallic hose of hard material comprising metallic intertting profile members forming the wall of the hose, and a flat metallic reinforcing strip wound edgewise between adjacent profile members and substantially flush with or projecting beyond the outer circumference of said hose.

10. As an article of manufacture, a flexible metallic hose having a recessed wall, and a flat metallic reinforcing strip wound edgewise with free lateral play in the wall of said hose, said reinforcing strip being arranged relative to said hose so as to intercept external strains, blows and the like.

In testimony whereof I have hereunto set my hand in the presence of two witnesses.

WILHELM GREINER. lVitnesses ALFRED FRIEDRICH, ROBERT H. NIER. 

